Using ESXi 5.5 (managed by vCenter) with vSphere Client, after some amount of time, it becomes impossible to mount an .iso in a VM. After selecting the .iso, the CD drive icon just hangs forever with "CD/DVD drive 1 (Connecting...)". The only way around it is to exit the vSphere Client and log back in.
Does anyone know why this happens or how to fix it? I've searched pretty extensively and I haven't found a solution to this problem.